# 12.4.5 Average e.i.r.p. per frequency

It presents the average e.i.r.p. per event (dBm vs MHz) for all the active WSDs transmitting at a certain frequency such that:

[![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/Embcf0xHHsLKekFk-image.png)](https://wiki.cept.org/uploads/images/gallery/2026-04/Embcf0xHHsLKekFk-image.png) (Eq. 68)

Let us assume a different example from above, where 4 channels have been identified for the <span data-highlighted="true" data-vc="highlighted-text"><span class="_kqswh2mm"><span class="_5pioz8co _189e1dm9 _1il9buyh _19lc184f _d0altlke" data-testid="definition-highlighter">WSD</span></span></span> to operate. Figure 257 shows that on average 33 dBm, for one event, was transmitted by the active WSDs at 1000.5 MHz , 8.82 dBm at 1001.5 MHz etc...

[![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/CjuE7SkZjHmhLAz8-image.png)](https://wiki.cept.org/uploads/images/gallery/2026-04/CjuE7SkZjHmhLAz8-image.png)

<div class="rich-media-item mediaSingleView-content-wrap image-align-start css-ptgm4k" data-layout="align-start" data-media-vc-wrapper="true" data-node-type="mediaSingle" data-renderer-start-pos="391" data-vc="media-single" data-width="408" data-width-type="pixel" id="bkmrk-figure-257%3A-average-"><div class="css-lemwds"><div data-alt="" data-collection="contentId-492979" data-context-id="492979" data-file-mime-type="image/png" data-file-name="7.png" data-file-size="20587" data-height="508" data-id="c6b57202-dbd5-47a4-9f2a-025d080182a3" data-node-type="media" data-renderer-start-pos="392" data-type="file" data-width="830"><div class="_2rko18qm _vchhusvi _kqswh2mm _ect4ttxp _p12f1osq _c71l1osq _1bsb1qmm _4t3ine4n _1hlmd0i9 _1rquusvi _eg541i5c _mts3kb7n _1ntskb7n _yfmhtlke _5sb1v00u new-file-experience-wrapper" data-media-vc-wrapper="true" data-testid="media-card-view" id="bkmrk-figure-257%3A-average--1"><div class="_1reo15vq _18m915vq _2rko18qm _1e0c1txw _kqswh2mm _p12f1osq _1bsb1osq _4t3i1osq _c71l1osq media-file-card-view" data-cursor="pointer" data-test-media-name="7.png" data-test-progress="1" data-test-source="remote" data-test-status="complete" data-testid="media-file-card-view"><div class="_kqswstnw _1bsb1osq _4t3i1osq _1e0c1txw _2lx21bp4 _1bah1h6o _4cvr1h6o align-center" data-testid="ImageRendererWrapper">![](blob:https://ecowiki.atlassian.net/9a232929-6f31-498c-8cd3-243f12427e72#media-blob-url=true&id=c6b57202-dbd5-47a4-9f2a-025d080182a3&collection=contentId-492979&contextId=492979&width=830&height=508&alt=&clientId=113268fe-fe5b-4bc3-8ff3-07965dbf1d18)**Figure 257: Average e.i.r.p. per frequency**</div></div></div></div></div></div>